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F. L. H. SIMS.

KEY BOLT.

APPLICATION FILED 050. II. I918.

1, 3 1 3, 748 I Patented Aug. 19, 1919.

UNITED STATES PATENT OFFICE.

FREDERICK L. H. SIMS, 0F TORONTO, ONTARIO, CANADA, ASSIGNOR TO THE DIAPHONE SIGNAL COMPANY, LIMITED, 015 TORONTO, CANADA.

KEY-BOLT.

Application filed December 11,1918. Serial No. 266,243.

To all whom it may concern.-

Be it known that I, FREDERICK L. H. SIMs, of the city of Toronto, in the county of York, Province of Ontario, Canada, have invented certain new and useful Improvementsin Key-Bolts, of which the following is a specification.

There has existed a great demand in ship yards and boiler works for bolts for drawing steel plates together as a preliminary to riveting. An important requirement in such bolts is that they shall have a considerable range of action, but shall be capable of being set up both rapidly and easily. The ordinary bolt and nut takes too much time in setting up and the headed key bolt described in my prior United States Patent No. 126633 1 dated May 14th, 1918 has been extensively used for this purpose. This bolt has been found to possess ample strength and rapidity of action for use in drawing plates of light and medium weight to place, but a demand has now arisen for a bolt of still greater strength and either greater power for the same range of action or greater range of action with the same power. It has been found diilicult to increase the strength of the key bolt of my prior patent by the use of high carbon or alloy steel owing to the difficulty and expense of forging the head, and if such difficulty be overcome the other requirements for heavy work would still remain unsatisfied.

The objectof the present invention therefore is to devise an improvement on the aforesaid key bolt which will permit the forged head to be dispensed with, and the bolt made of a high grade steel, and which will give either greater range of action or greater power as may be desired.

I attain my object by means of the constructions hereinafter described and illustrated in the accompanying drawings in which- Figure 1 is a plan view of the blank from which the bolt is formed;

Fig. 2 a side elevation of the same;

Fig. 3 a side elevation of the finished bolt;

Fig. 4 a horizontal section showing the bolt in position to draw two plates together and with two keys in place;

Fig. 5 a cross section on the line A-A in Fig. 3;

Specification of Letters Patent.

Fig. 6 a cross section on the line B--B in Fig. 3;

Fig. 7 a side elevation of a gib to be used as a head for the bolt; and

Fig. 8 a side elevation of another form of gib.

In the drawings like numerals of reference indicate corresponding parts in the different figures.

The bolt is formed from the blank shown in Figs. 1 and 2. This blank comprises a half round metal bar having a portion 1 of its flat face at each side of the middle portion 2 oil'set, leaving a portion 3 at each end with its face in the same plane as the face of the metal portion 2. Preferably the offsetting is done in such a way as to maintain the same cross sectional area in each of the said offset portions as in the end and middle portions, though in cases where extreme strength is not required this arrangemont need not be rigidly followed.

The portions 2 and 3 are so proportioned that the combined length of the portions 3 is substantially equal to that of the portion 2. The blank as shown may be formed by rolling, stamping or forging as may seem best.

The bolt is formed from the blank by bending it at the middle of each of the portions 1, bringing the ends 3 together and with their flat faces in contact with the flat face of the middle portion 2. For certain purposes the bolt may then be considered to be complete,but to adapt it for use as set forth in the preamble to this specification, it is essential to at least weld the ends 3 together, and to obtain the best results these ends must be welded also to the middle portion 2. This welding may be effected electrically or by any other well known process.

The finished bolt thus possesses a slot 1 adjacent each end. If this belt is required to be used in the same manner as the key bolt shown in my prior patent hereinbefore referred to a gib 5 such as shown in Fig. 7 or a gib 6 such as shown in Fig. 8 may be inserted in one of the slots and a wedge key 7 used in the other slot.

If the adjustment of the bolt from each side is desired a wedge key 7 may be employed in each slot.

Owing to the fact that the bolt possesses two slots, by using two Wedge keys. I can obtain a greater range of action than. with va single slotted bolt using Wedge keys of 5 torily attains the object of my invention: as

set out in the preamble to this specification.

What I claim as my invention is 1.. A substantially cylindrical bolt formed with a non-slotted middle portion and with end portions each having a substantially fiat sided slot formed longitudinally therein, said slotted portions being increased in periphery to give a cross sectional area of metal therein substantially equal to that in the non-slotted central portion. 7

V 2. A blank for a'slotted keybolt' comprising a half round metal bar" having a portion of its fiat face at each side of the middle offset, leaving aportion at each end with its face in the sameplane as theface of the mid dle portion, the combined length of the fiat faces of suchen-d' portions being substantially equal to the length of the fiat face of the middle portion; I

3. A blank for a slotted keybolt comprising a half round metal bar having a portion of its flat face at each'side of the 'middle offset, leaving a portion at each end with its face in the same plane asthe face of the middle portion. v

4. A blank for a slotted keyboltcompriscopies of this patent may be obtained for ing a half round metal bar having portion at each side of the middle offset leaving a portion. at each end with ,itsflat face in the same plane as theface of the middle portion, the cross section of each of said oil"- set portions being substantially equal to that of the end and middle portions.

5. A blank for a slotted keybolt c0mpris- 'ing a half round metal bar having a portion: each sideofthe middle offset leaving a portion at each end with its flat face in the same plane as the face of the: middle portion, the cross section: of eachof said offset portions being substantially equal to'that of the end middle portions, and the combined length of the flat. faces of such end portions beingsubstantially equal to the length of the flat face of the middle portion. a r o 6. A substantially cylindrical bolt formed with a non-slotted middle portion and with,

end portions each having a substantially flat sided slot formed longitudinally therein, a longitudinal division extending through the middle portion-to the endsof the said slots substantially parallel to-the' sides thereof. Y v f 7. A substantially cylindrical-bolt formed with a non-slotted middle "portion and With end portions each having a'substantially flat sided slot formed. longitudinally therein, a longitudinal d-ivisionextending through the middle portion to the ends of the said slots and substantially parallel. to the sides there'-;.

of, and a transverse division extending through one part of the divided'm-iddleportion. 7 r

v8. A substantially cylindrical bolt formed with a non-slotted middle portion and with end portions each having a'substantially flat sided slot formed longitudinally therein. 7 Signed at Toronto, Canada, this 3rd day of December, 1918. ,7 p

' FREDERICK L. H. SIMS.

five cents each, by, addressing. the Commissioner of Patents, Washington, D50," i i 

